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Treadmill Icon Health PETL5902, 2003

Discussion in 'Electronic Repair' started by N_Cook, Nov 5, 2013.

  1. N_Cook

    N_Cook Guest

    No DC motor control
    15V and Sig LEDs on but no Gate or HV bus LED.
    Bit of a chicken and egg situation.
    5V supply also ok
    Mains side uses a pair of SCRs driven by a triac opto that has its
    driving internal LED biased off, to provide the power DC as distinct
    from minor supply that is present.
    Main control is some custom uC.
    DC side uses a powerFET to control the motor .
    It seems that if there is no gate signal to the MOC opto so there is not
    any rectified HV dc for the powerFET , or could the Power|FET be non
    functional to some low power test setup and the uC locks out.
    Will remove the powerFET and check out of circuit , but at this stage
    that seems the limit of any further fault finding. Even applying some
    sort DC I asume the uC will lock out anyway, or the uC is corrupt of
    course, either way no further forward
  2. N_Cook

    N_Cook Guest

    Surely if exercise machines were designed properly, the person using
    them would be powering the electronics
  3. Nelson

    Nelson Guest

    You can sometimes find salvaged/repair parts on the net. I have a
    Precor Elliptical Trainer with similar problems. The custom IC's are
    hard to get around especially with no schematics. Good luck.

    I am toying with the idea of building my own replacement controller
    using a Raspberry Pi or Arduino. I'm thinking I can work backward from
    the discrete components and perhaps build an even better controller.
    But it's no quick fix :)
  4. N_Cook

    N_Cook Guest

    removed the powerFET and solid 25 ohm gate to s/d , tried a lower rating
    one but the driving sense amplier may have been knocked out, other than
    14V supply to it, no further forward, at least referenced to 0V so
    scopeable , but I suspect the uC has "fingers" in all directions
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